slides created by Marty Stepp CSE 341 Lecture 29 b Course wrap-up slides created by Marty Stepp http://www.cs.washington.edu/341/

One view of languages ML Java Scheme JavaScript functional object-oriented statically typed ML Java dynamically typed Scheme JavaScript functional object-oriented statically typed dynamically typed

A broader view Not all languages are functional or OO! logic languages (e.g., Prolog) scripting languages (Perl, Python, Lua) query languages (SQL) purely functional languages (Haskell; no ref or set!) visual languages, spreadsheet languages, GUI-builders, text-formatters, hardware-synthesis, ... languages with heavy support for parallel programming

Why did we do this? the time needed to "pick up" a new language will drop dramatically (though you have to learn its libraries, too) use mutation for what it's good for; not to create brittle programs with unseen dependencies syntax matters, but it's not everything apply idioms in languages besides where you saw them recognize that language-design is hard; semantics should not be treated lightly; more syntax is not always better

Big ideas code runs in environments; scope/resolution matters recursive data is processed with recursive functions without mutation, copying vs. aliasing is indistinguishable closures have many powerful uses (dis-) advantages of static typing (and what is checked) when evaluation occurs is important (thunks/macros) OO vs. FP: many similarities and a couple big differences parametric polymorphism vs. subtyping can embed a language in another via interpreters/macros

Big picture questions Which language we learned is your favorite? Why? Least favorite? What are the pros and cons of static/dynamic typing? What are some benefits of coding in a functional style? How does a functional language handle extensibility and reusable code, as opposed to how OO languages do it?

What next? learn more about the languages we covered be careful/honest when listing them on your resume...! learn a language similar to / inspired by ones we saw Scala: functional/OO mixture that runs on Java VM F#: Microsoft's ML clone; can interact with C# code C#: Microsoft's Java clone Clojure: Scheme/Lisp dialect that runs on Java VM Scala/Ruby/Lua: dynamic and high-level, like JavaScript take CSE 401 (Compilers) learn much more about how compilers/interpreters work